Forgot to mention, if this is a redundant ground, it may not be a problem.....sometimes a PCM/ECM Circuit may have more than one ground to it...so if one is lost, there is another in parallel to do the job.....the only way to know is by looking at a wiring diagram....

If this ISN'T a redundant ground, then you have a problem....

But as I said before, late 80'*, early 90'* ECM'*, had lots of problems....even when replaced with a rebuilt, there could be another problem in the "new" ECM....I have had rebuilt'* right out of the box(PROM transferred), not start a car...

Majority of ECM grounds are located on studs on the transmission....might be worth it to do visual inspection there, and give each wire a tug.....

The cause of this problem ended up being that one of the wires on the ignition module harness had started to come apart and actually corrode causing the injectors to cycle on really fast as they would when you turn the ignition on. I believe it was pin "F" on the ignition module harness that I had to re splice.

That solved the problem .

Thanks for letting us know the fix!

Thread closed.

3 years later.